So that the two lines below give the same answer: xx <- c(); yy <- 1:3
sum(xx) + sum(yy) sum(c(xx, yy)) On Tue, Apr 20, 2010 at 12:42 PM, <will.ea...@gmx.net> wrote: > Dear all, > > just a stupid R question, since the results puzzle me a bit: > >> sum(c(NA,NA), na.rm=TRUE) > [1] 0 >> NA + NA > [1] NA >> NA + 1 > [1] NA >> > > Why does sum(c(NA,NA), na.rm=TRUE) return 0 and not NA? > > Thanks in advance, > > Will > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
